I think the header is plugged into the board. I just figured since the plugs in the back are directly attached to the board that those would be more likely to work. but I guess at this point I need to try them all.
Have you tired another mouse, or tired this mouse on another computer to be sure this mouse works?
It could be a corrupted USB hub drivers, you can go into Device Manager and remove all the USB hub drivers. When you go back to the desktop the system will rediscover them and reinstall the drivers for them automatically.